It depends on the work you do. ChatGPT — for people who want one tool that does a bit of everything. Claude — for people whose work revolves around documents such as reports, proposals and meeting minutes. Gemini — for teams that use Google Workspace (Gmail, Drive).
AI Basics · Tool Comparison
ChatGPT vs Claude vs Gemini Comparison
These are the three tools people compare most often when choosing their first AI for work. All three are free to start, so the differences lie in what each does best and how each handles company data.
Free plans, Korean support, pricing, and security in one tableChecked 26 Sep 2026
VERDICT
How to choose
The “best for” notes from each tool’s page, side by side.
ChatGPT — Best for- People who want one tool that does a bit of everything
- People trying AI for the first time for free
- People who want images and voice in the same account
Better fit elsewherePeople whose work centers on reading long documents and polishing text
Learn more about ChatGPT →Claude — Best for- People whose work revolves around documents such as reports, proposals and meeting minutes
- Anyone who dislikes writing that sounds AI-generated
- People who work with material that must be accurate, such as regulations and contracts
Better served by other toolsPeople whose main goal is creating images or video
Learn more about Claude →Gemini — Best for- Teams that use Google Workspace (Gmail, Drive)
- Managers rolling out AI across the organization for the first time
- Planning and sales roles that often research current information
Better fit elsewherePeople for whom the quality of long-form writing matters most
Learn more about Gemini →COMPARE
Compared in one table
Pricing and terms were checked directly on each tool’s official pages. Check the official page again before you pay.
| Feature | ChatGPT | Claude | Gemini |
|---|---|---|---|
| Verdict | A comeback with Astra | The most talked-about AI | Google’s all-purpose AI |
| Developer | OpenAI | Anthropic | |
| Free | Free plan available The free plan gives you plenty of text chat, while image generation, voice, and deep research come with limits. | Free tier available Create an account and use it free up to a daily limit. Heavy work use reaches that limit quickly. | Free tier available With just a Google account, you can use the basic features for free. Stronger models and more capacity unlock on paid plans. |
| Korean | Excellent Handles Korean conversation well, and the official pricing page and app are available in Korean. | Excellent Questions and answers both read naturally in Korean. It follows instructions on formal speech levels and report-style writing well. | Excellent Korean questions and answers both read naturally, and it is strong at finding the latest Korea-related information. |
| Level | Beginner | Beginner | Beginner |
| Individual plans (start here) | Plus KRW 29,000 (≈ US$22)/month | Pro $22/month | Google AI Pro KRW 29,000 (≈ US$22)/month |
| Company pricing | No dedicated business plan | Team · Standard seat $27.50 per user/month | Workspace Business Standard $14 per user/month |
| Training on your input | In the comparison table on the official pricing page, the “Use your content to train our models” row for personal plans is marked “Can opt out.” That means you have to turn it off yourself in settings if you don’t want your content used. | Anthropic states that it does not use consumer conversations for model training by default. However, this can vary by settings and plan, so check the current terms before rolling it out company-wide. | Conversations on free personal accounts may be used to improve the service, according to the provider. For company work, it is safer to use an organizational Google Workspace account. |
| What it does well |
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| Weaknesses | With plans now split into Free, Go, Plus and Pro, it has become hard to say exactly what each one covers. The Go plan on the official pricing page carries a notice that it may include ads, and the “Use your content to train our models” row for personal plans is marked “Can opt out.” That means you have to turn off the default yourself. | It does not generate images, and for real-time questions such as today’s news, a tool with built-in search is the better choice. It’s best described as a tool built for reading, writing and thinking. | When polishing a long report, it can produce fairly ordinary prose. Many people split the work: Gemini for finding and organizing, Claude for writing and refining. |
SCORE
Nanum ratings compared
Subjective ratings (out of 5) from John Kim, CEO, based on use in training sessions and real work. All three tools are scored on the same criteria.
Writing
ChatGPT
Claude
Gemini
Long-document analysis
ChatGPT
Claude
Gemini
Research and search
ChatGPT
Claude
Gemini
Image generation
ChatGPT
Claude
Gemini
Video generation
ChatGPT
Claude
Gemini
Easy to get started
ChatGPT
Claude
Gemini
Coding ability
ChatGPT
Claude
Gemini
DETAIL
Tool reviews
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Related pages
Best AI Chatbots ComparedBest AI Image Generators ComparedClaude vs ChatGPTGemini vs ChatGPTBest AI for ReportsAI for Finance & AccountingAI for New HiresBest AI for Document SummariesAI for HR ManagersAI for PlannersAI for ExecutivesAI for Team LeadsBest AI for ResearchBest AI for YouTube Video SummariesBest AI for Email
This comparison is not the result of running the same prompt through several tools. It brings together what we verified for each tool (official pricing pages, terms of service, and Nanum’s own ratings) in one place.
FAQ
- ChatGPT: The free plan offers generous text chat, with limits on image generation, voice, and deep research.
- Claude: Create an account and you can use it free up to a daily limit. If you use it heavily for work, you’ll hit the free limit quickly.
- Gemini: With just a Google account, you can use the basic features for free. Stronger models and more capacity are available on paid plans.
- ChatGPT (excellent Korean): Holds Korean conversations well, and the official pricing page and app are also available in Korean.
- Claude (excellent Korean): Questions and answers both read naturally in Korean. It follows instructions on honorific speech and formal report style well.
- Gemini (excellent Korean): Natural in Korean for both questions and answers, and strong at finding the latest Korea-related information.
- ChatGPT: In the comparison table on the official pricing page, the 'Use your content to train models' item for personal plans is marked 'Can opt out.' That means you have to turn it off yourself in settings if you don't want your content used.
- Claude: Anthropic states that it does not use consumer conversations for model training by default. However, this can vary by settings and plan, so check the current terms before rolling it out company-wide.
- Gemini: Conversations on free personal accounts may be used to improve the service, according to Google. If you use it for company work, it is safer to use an organizational Google Workspace account.
Last updated 22 Sep 2026 · Free-plan availability, pricing, and terms are the values confirmed on each tool’s official page. Ratings are based on John Kim, CEO of Nanum Consulting, using these tools firsthand in training sessions and real work.
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